body{
    background-image: url(../img/登录大背景图.jpg);
}
.div{
    background-color: palegreen;
    width: 560px;
    height: 300px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform:translate(-50%,-50%);
}
.div{
    background-image: url(../img/登背小.jpg);
    background-position: 100%;
    /* background-repeat: no-repeat; */
    background-size: cover;
}
form{
    margin-left: 140px;
    margin-top: 50px;
}
.li{
    margin-left: 100px;
}
.x{
    width: 280px;
    position: relative;
}
.r{
position: absolute;
right: 0;
}